NEWTOWN, Conn. (AP) — The whereabouts of a time capsule buried in 1980 at Sandy Hook Elementary School has become a mystery that Newtown officials are trying to solve before crews demolish the building where 20 first-graders and six educators were killed.

First Selectman E. Patricia Llodra told The News-Times of Danbury (http://bit.ly/1fdRDWn ) she recently learned about the time capsule, which purportedly contains artwork, pictures and other school mementos.

Llodra and school officials are seeking people who were fifth-graders at Sandy Hook in 1980 and who remember where the capsule is buried.

Town officials have approved a plan to demolish the school and build a new one on the same property, but residents still need to vote on the proposal. If approved, the school would be torn down by the end of the year.

Llodra said that if the time capsule is found, officials will have to decide whether to open it or rebury it to save it for a future generation.

“It would be interesting to see what’s in that time capsule — 11-year-olds writing about the future, things that they wanted people to know about their school and neighborhood,” she said.

Sandy Hook students have been attending a school renovated just for them in the neighboring town of Monroe since the Dec. 14 shootings. Gunman Adam Lanza, 20, fatally shot the 26 victims and himself, after killing his mother at their Newtown home. The motive remains unclear.

A final state police report on the massacre is expected to be released in the fall.

Newtown residents, meanwhile, are scheduled to vote Oct. 5 on whether to accept a $49 million state grant to build a new school on the same 12-acre property. Approval of the plan would clear the way for the 56-year-old school to be razed and for planning and designing of the new school to begin.

Llodra said the time capsule is a treasure she would like to find before the demolition.